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You want to build a 1100 square foot rectangular infinity pool. Three of the sides will...

You want to build a 1100 square foot rectangular infinity pool. Three of the sides will have regular pool​ walls, and the fourth side will have the infinity pool wall. Regular pool walls cost ​$12

per foot​ (regardless of how deep the pool​ is), and the infinity pool wall costs ​$35

per foot​ (regardless of​ depth). How long should you make the infinity wall so that you minimize your​ costs?

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